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Effects of motion segment simulation and joint positioning on spinal loads in trunk musculoskeletal models
, Article Journal of Biomechanics ; 2017 ; 00219290 (ISSN) ; Eskandari, A. H ; Shirazi Adl, A ; Arjmand, N ; El-Ouaaid, Z ; Plamondon, A ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
Musculoskeletal models represent spinal motion segments by spherical joints/beams with linear/nonlinear properties placed at various locations. We investigated the fidelity of these simplified models (i.e., spherical joints with/without rotational springs and beams considering nonlinear/linear properties) in predicting kinematics of the ligamentous spine in comparison with a detailed finite element (FE) model while considering various anterior-posterior joint placements. Using the simplified models with different joint offsets in a subject-specific musculoskeletal model, we computed local spinal forces during forward flexion and compared results with intradiscal pressure measurements. In...
Nonholonomic motion planning based on optimal control for flight phases of planar bipedal running
, Article Electronics Letters ; Volume 47, Issue 20 , 2011 , Pages 1120-1122 ; 00135194 (ISSN) ; Akbari Hamed, K ; Dumont, G. A ; Graver, W. A ; Sharif University of Technology
2011
Abstract
Presented is a novel approach for online trajectory modification of joint motions to transfer a free open kinematic chain, undergoing flight phase, from a specified initial configuration to a specified final configuration. Formally, it is assumed that a nominal trajectory, computed offline, can reorient the kinematic chain (reconfiguration problem) for a given angular momentum on a time interval. A modification algorithm of body joints, based on optimal control, is developed such that for different angular momentums and time intervals, the same reconfiguration problem can be solved online. This approach can be utilised for space robotics applications and online computation of planar running...
Effects of motion segment simulation and joint positioning on spinal loads in trunk musculoskeletal models
, Article Journal of Biomechanics ; Volume 70 , March , 2018 , Pages 149-156 ; 00219290 (ISSN) ; Eskandari, A. H ; Shirazi Adl, A ; Arjmand, N ; El-Ouaaid, Z ; Plamondon, A ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
Musculoskeletal models represent spinal motion segments by spherical joints/beams with linear/nonlinear properties placed at various locations. We investigated the fidelity of these simplified models (i.e., spherical joints with/without rotational springs and beams considering nonlinear/linear properties) in predicting kinematics of the ligamentous spine in comparison with a detailed finite element (FE) model while considering various anterior-posterior joint placements. Using the simplified models with different joint offsets in a subject-specific musculoskeletal model, we computed local spinal forces during forward flexion and compared results with intradiscal pressure measurements. In...